Homestart will refresh its duration as long as your champion stays in the fountain, leaving the fountain will prevent the buff from refreshing.

Homeguard

Homeguard is granted to all champions in the fountain, starting at 20 minutes on classic 5v5 Summoner's Rift. Kayn also gains a non-refreshing Homeguard upon completing one of his transformations, which can occur on any map and at any time.

Homeguard grants 75% - 150% (based on minutes)bonus movement speed that decays over 7 seconds. While in the fountain, restores 12% of missing health and 12% of missing mana per fountain healing tick.

Receiving or dealing damage will remove all effects and prevent you from gaining them again for 8 seconds. Damage dealt to enemies further away than 5000 units will not disable Homeguard.

Homeguard's duration will be refreshed whenever the champion is in the fountain.

Notes

Homeguard activates upon entering/spawning on your starting platform. Simply standing on the stairs will not grant the buff; champions must stand on the center of the platform where they are dropped after spawning or recalling.

Strategy

Homeguard dramatically reduces the time needed to fully regenerate at the fountain, making it effective at outlasting enemies sieging the entrance of your base.

It is possible to Teleport to a distant location while still standing on the starting platform, allowing you to utilize Homeguard's speed elsewhere. This can often catch opponents off guard, especially with champions that usually have a hard time catching up with enemies.

Empowered Recall

Empowered Recall can also increase a champion's movement speed when returning to their fountain. This is gained with Hand of Baron or Eye of the Herald, through which their Recall is also improved:

Empowered Recall: Your champion starts to hard channel for 4 seconds. If the channel is not interrupted, the champion will be teleported to their team's fountain, will restore 50% of your champion's maximum health, 50% of your champion's maximum mana and will gain 50% bonusmovement speed for 8 seconds. (Self range) (0 second cooldown)

Trivia

Homestart and Homeguard will trigger move-fast animations where available, and can often be the only time such animations are seen in a given game.

When unavailable, the champion's standard movement animation will be used but at incredible speed, such is the case for Nautilus, Pantheon, Vayne, and Zac.

Some champions and skins feature animations exclusive to Homestart and Homeguard, and cannot be trigger elsewhere even if similar speeds are reached - e.g. Heimerdinger, PROJECT Vayne [S|L] and Pool Party Rek'Sai [S|L]. This is often due to the animations not being designed to blend into general gameplay.